Paper sheet.



No. 743,375. PATENTEDNOV. 3., 1903. W. N. CALDWELL.

PAPER SHEET.

APPLICATION FILED JAN. 10, 1902.

no MdDEL.

Unwrap Srarns Patented November 3, 1903.

Parana VFFECEQ WINFORD N. CALDWELL, OF SPRINGFIELD, MASSACHUSETTS, ASSIGNOR TO CHARLES F. BACKUS, OF DETROIT, MICHIGAN.

PAPER SHEET.

SPECIFICATION forming part of Letters Patent N 0. 743,375, dated. November 3, 1903.

V Application filed January 10, 1902. Serial No. 89,134- (No model.) I

To all whom it may concern:

Be i t known that I, WINFORD N. CALDWELL, a citizen of the United States, residing at Springfield, in the county of Hampden and State of Massachusetts, have invented certain new and useful Improvements in Paper Sheets, of which the following is a specification, reference being had therein to the accompanying drawings.

The invention consists in an improvement in paper sheets, and particularly in a sheet made up of a multiple of webs, plies, orlayers, one or more being in separated sections, the webs or layers being combined in such a way that there is a reduced amount of stock along the line of the division between the said separated sections, all as more fully hereinafter described, and specifically pointed out in the claim.

In the drawings, Figure 1 is a diagrammatic perspective view illustrating the cylinders' and the pulp sheets being taken therefrom to be combined into the formed paper sheet. Fig. 2 is a cross-section through the completed sheet of paper produced by the cylinder referred to. 4

The object of my invention is to produce a sheet of paper having extending through it a continuous straight thinned portion which at that point will give greater flexibility without breaking the continuity of the web by creases, perforations, cuts,or slits and whereby the same may be made economically and in an expeditious manner.

A, B, and 0 represent three cylinders, which may be the cylinders of the usual cylindermachine, which of courseare combined with the necessary pulp-vats and other mechanism well known in paper-making and which I do not deem it necessary to explain. The cylinder A and the cylinder 0 being the outer cylinders of the series are adapted to produce webs, plies, or layers D and E which are continuous from side to side in the usual manner of making multi-ply paper. The cylinder B has a cylindrical band or bands F arranged around its reticulated surface, these bands covering such surface to the desired extent or width that the thin portion of the completed sheet is desired to have. With the cylinder such as shown at B in Fig. 1, having two bands F thereon, there will come from the cylinder'three sections a, b, and c, which are separated from each other a width equal to the width of the bands F. The webs or layers D and E and the strips or narrow webs a b 0 upon the cylinder B will then pass to the usual rolls, such as G,where the whole will be compacted into an integral sheet, the webs D and E being outside of and inclosing the strips a b c. This produces a sheet in which the outer layers are unbroken and the inner one is broken and at such broken places forming a thin or reduced thickness.

In the process of rolling the layers together the two outer layers at the point between the layers a b 0 will be pressed together, as shown at H in Fig. 2, and at this point will simply be a two-ply sheet, while at the other points will be a three-ply sheet. It will be noted that the separated sheet is so formed and is of such thinness as to make no appreciable exterior shoulder at-the separated edges thereof. The paper thus formed in a continuous web may be cut up in the desired manner to produce book-leaves, having the thin portion arranged nearthe binding to form a hinge upon which the leaf may turn, such hinge being formed without in any way cutting,

bending, or perforating the paper and with a continuous surface formedby the outer webs of the multi-ply sheet.

What I claim as my invention is- A ledger-leaf formed of a plurality of layers and having a narrow thin portion constituting a hinge formed by a divided intermediate layer arranged with its sections spaced a slight distance apart, the outside layers of the leaf being continuous from end to end and presenting a smooth surface adapted to be ruled or written upon. 7. I

In testimony whereof I afiix my signature in presence of two witnesses.

WINEORD N. CALDWELL.

Witnesses:

ALFRED Lnnns, WM. H. Hnvwoon. 

